Adding ASGI support to runserver

I still don’t get what the current way to get asgi from Django runserver to run is? I have a websocket which doesn’t work when I use runserver, the ideal solution where you can just add --asgi to runserver seemed really nice or even just make it work built in. It seems like people thought a lot about this topic and in the end nothing came from it? Or am I missing something? I’m currently on Django 4.1.1 and don’t know how to get the asgi to work in my dev environment.